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本文给出一批M型巨星JHK测光结果,在此基础上讨论了M巨星在(J—H)~(H—K)双色图上的分布特点及其有效温度及总辐射能的近似求法,并依据IRAS资料讨论了它们在中远红外双色图上的分布特征。 相似文献
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利用瑞士Gornergrat天文台的意大利1.5米TIRGO红外望远镜对近红外交源IRAS04000+5052进行了近红外成像观测,得到了JHK宽带及H2S(1)1~0和Br窄带高分辨率图像,并进行了红外测光及位置测量工作.结果发现此IRAS源不是以往认为的单一年轻天体,而是一个包含有许多个年轻天体的小尺度致密恒星形成区,在这样小尺度且致密区域内,恒星形成也不是在同一时期完成的. 相似文献
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对S140中的红外源用北京天文台1.26米红外望远镜进行了近红外测光,获得了J.H.K三个波段的流量值,并利用红外天文卫星及地面红外和亚毫米波观测资料作了光谱综合分析,得出光谱斜率、红外光度和红外源的壳层结构。 本文还结合CO及NH_3等观测结果分析了红外源成协气体的供热,除了通过尘埃的作用,中心源还可能通过激波对气体输入能量;我们还讨论了外部热源及光电过程和宇宙线的加热作用。 相似文献
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胡景耀 《中国天文和天体物理学报》1987,(4)
被Zwicky等人列为星系的NGC 2242,后来刘继英等人发现它具有发射特征并认为可能是行星状星云。前原英夫等人用有缝光谱肯定了它是一个行星状星云。我们证认它是IRAS06304+4448。根据IRAS Point Source Catalog所提供的25μm和60μm的辐射流量,我们得到了这一行星状星云的尘埃温度T_d=130K,光学厚度τ_(25μm)=1.98×10~(-7)和尘埃的总质量M_d=1.0×10~(-7)到1.8×10~(-6)M_⊙之间。 相似文献
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用中科院射电联合实验室上海天台25米望远镜,对19个已知水脉泽源和20个HII区候选源进行了水脉泽观测和搜寻,共测到水脉泽辐射21个,包括2个首次测到S/N≥3σ的源。结合已知脉泽资料求出了脉泽时变,发现峰值流量的变化比较普遍,包括同一峰强度变化及不同成分置换引起的变化两种情况,峰值速度变化多数由不同成分置换所造成。证认了对应的IRAS源并探讨了脉泽辐射与红外参量的关系,表明红外辐射的强度对脉泽 相似文献
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利用瑞士Gornergrat天文台的意大利1.5米TIRGO红外望远镜对近红外变源IRAS04000+5052进行了近红外成像观测,得到了JHK宽带及H2S(1)1 ̄0和Brγ窄带高分辨率图像,并进行了红外测光及位置测量工作。结果发现此IRAS源不是以往认为的单一年轻天体,而是一个包含有许多个年轻天体的小尺度致密恒星形成区,在这样小尺度且致密区域内,恒星形成也不是在同一时期完成的。 相似文献
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从理论N体模拟、射电辐射、红外辐射以及统计比较等几个方面,概述了棒在星系恒星形成中的作用,并讨论了在这一问题研究中出现的互相予盾的一些结果。 相似文献
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在18及6厘米,以基线长分别达15及23兆波长的欧洲长基线干涉网(EVN),对类星体4C 39.25作了VLBI观测,试图搜寻该类星体的中等尺度——10到100毫角秒(mas)的结构。 观测未曾检测到这种尺度上超过核峰值亮度5%的明显结构。但核自身看来有2到4毫角秒的延伸,而且其流量可变。 相似文献
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The problem of remote sensing of the surface through a planetary atmosphere is considered. An efficient approach to the atmospheric correction of satellite information is developed. A model for the atmospheric transfer properties is represented as a linear functional—the superposition integral underlying the classical linear-system approach. The optical transfer operator is constructed mathematically rigorously and physically correctly by the method of influence functions and spatial-frequency characteristics. The influence functions and spatial-frequency characteristics of an atmosphere–planetary surface system are the kernels of the functionals and objective characteristics, which are invariant to specific structures of the objects being sensed and to illumination and observing conditions. The spatial-frequency characteristics are introduced as Fourier transforms of the influence function in horizontal coordinates. The foundations of the spatial-filtering theory are outlined for the problem of remote sensing, which have a wide range of applications. The main problems of the theory and mathematical modeling of three-dimensional radiative transfer are pointed out. 相似文献
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A. V. Megn 《Kinematics and Physics of Celestial Bodies》2008,24(6):271-279
Spectral characteristics of extragalactic radio sources of synchrotron emission with spectral flux density maxima located at decameter wavelengths are studied on the basis of the Grakovo catalog data. Physical processes in space that can give rise to such spectra are considered. Angular sizes and possible characteristics of relevant cosmic plasma are determined for a number of sources. 相似文献
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Results are presented from an analysis of observations in a sample of 53 long-period pulsating stars (44 of which are Mira-type
and 9 are semiregular variables). A catalog of the characteristics of the individual pulsation cycles of the light curves
is obtained for these stars. A correlation analysis of the characteristics of the individual pulsation cycles is carried out
for each star. A number if diagrams relating the variability of the characteristics of the individual cycles to the average
parameters of the variability of the stars and to their spectral classes. New criteria for classifying long-period variables
are proposed on the basis of these diagrams.
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Translated from Astrofizika, Vol. 49, No. 4, pp. 595–612 (November 2006). 相似文献
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就太阳质子事件预报研究的重要意义,产生太阳质子事件的太阳活动区的一般特征,质子耀斑的辐射特征,质子事件几个重要参数预报方法简述了目前的研究进展。还给出了当前为满足用户需要改进预报应着重研究的方面。 相似文献
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The existence of a third isolating (nonclassical) integral of motion is, in a certain sense, related to a nongaussian velocity
distribution in stellar systems. Based on a previously found series of models with St?ckel potentials, several characteristics
of these models are generalized by linear superposition to describe some observed properties of galactic systems. Corresponding
formulas for the circular rotation velocity and surface density are obtained. The variations of these characteristics are
plotted graphically for two interesting cases. 相似文献
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The properties of such phenomena as the appearance of humps at the ascending branch or double peaks in the light curve of
long-period pulsating stars are examined. The characteristics of humps and the average light curves are obtained for a group
of Mira-type stars and semiregular (SRa) variable stars. Correlations between the parameters of the light curves and the characteristics
of the humps for these stars are discussed. The results obtained here are compared with published theoretical models.
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Translated from Astrofizika, Vol. 50, No. 1, pp. 99–105 (February 2007). 相似文献
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分别在薄盘和厚盘两种情况下,讨论吸积盘的中心黑洞在顺行积和逆行吸积中的演化特征,结果表明,黑洞的温度和熵在逆行吸积与顺行吸积中的演化特征很不相同;在顺行吸积中黑洞的温度单调减小,而在逆行吸积中黑洞的温度存在一个极大值;在吸积的全过程中,黑洞的熵始终是增加的,而且逆行吸积中黑洞熵的变化率要比顺行吸积中的黑洞熵的变化率大得多,此外还讨论了在吸积过程中,黑洞质量的相对变化与黑洞自转的相关性。 相似文献